TTL - TimeToLive

TTL.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class TTL : MonoBehaviour
{
	public float AgeLimit;
	float age;

	public System.Action<GameObject> Callback;

	void Reset()
	{
		AgeLimit = 2.0f;
	}

	public static TTL Attach( GameObject go, float agelimit)
	{
		TTL ttl = go.AddComponent<TTL>();
		ttl.AgeLimit = agelimit;
		return ttl;
	}

	void Update ()
	{
		if (age > AgeLimit)
		{
			if (Callback != null)
			{
				Callback(gameObject);
			}

			Destroy(gameObject);

			return;
		}

		age += Time.deltaTime;
	}
}

To use, any ONE of these methods is valid:

• drag/drop it on a GameObject / Prefab, set the ageLimit field as desired

• call TTL.Attach(myDoomedGameObject, 2.0f); to doom your GameObject

• just use AddComponent() yourself if you prefer

Optionally you can supply a Callback function that will be called at the time of destruction.